// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package writer

import (
	"github.com/m3db/m3/src/metrics/metric/aggregated"
	"github.com/m3db/m3/src/x/errors"
)

type multiWriter struct {
	writers []Writer
}

// NewMultiWriter creates a new multi-writer.
func NewMultiWriter(writers []Writer) Writer {
	return &multiWriter{writers: writers}
}

func (w *multiWriter) Write(mp aggregated.ChunkedMetricWithStoragePolicy) error {
	multiErr := errors.NewMultiError()
	for _, writer := range w.writers {
		if err := writer.Write(mp); err != nil {
			multiErr = multiErr.Add(err)
		}
	}
	return multiErr.FinalError()
}

func (w *multiWriter) Flush() error {
	multiErr := errors.NewMultiError()
	for _, writer := range w.writers {
		if err := writer.Flush(); err != nil {
			multiErr = multiErr.Add(err)
		}
	}
	return multiErr.FinalError()
}

func (w *multiWriter) Close() error {
	multiErr := errors.NewMultiError()
	for _, writer := range w.writers {
		if err := writer.Close(); err != nil {
			multiErr = multiErr.Add(err)
		}
	}
	return multiErr.FinalError()
}
